QSFP-40G-CSR4 – 40G CSR4 QSFP – MPO MMF – 300m OM3
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QSFP-40G-CSR4 Description
QSFP-40G-CSR4 is a Cisco 40GBASE-CSR4 QSFP optical transceiver in the Cisco 40GBASE QSFP Modules family, used for 40 Gigabit Ethernet links over multimode parallel fiber on Cisco QSFP 40G ports. The module uses an MPO or MTP multifiber connector, carries the link across four 10G lanes compliant with IEEE 10GBASE-SR specifications, reaches 300 m on OM3 and 400 m on OM4 or OM5 multimode fiber, supports native 40G links or 4x10G breakout through parallel-to-duplex fiber breakout cabling, and is specified at 1.5W power consumption.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
QSFP-40G-CSR4 |
|
Product type |
40GBASE-CSR4 QSFP optical transceiver |
|
Form factor |
QSFP |
|
Ethernet rate |
40 Gigabit Ethernet |
|
Optical lane design |
Four 10G lanes |
|
Connector type |
MPO or MTP multifiber connector |
|
Fiber type |
Multimode fiber |
|
Wavelength |
850 nm |
|
Reach on OM3 |
300m |
|
Reach on OM4 or OM5 |
400m |
|
Power consumption |
1.5W |
Application Scenarios
Use QSFP-40G-CSR4 for Cisco QSFP 40G ports when the design keeps an MPO or MTP multimode trunk but needs more reach than the SR4 distance class allows.
This module supports a 4x10G breakout design through a parallel-to-duplex fiber breakout cable. The order should confirm both Cisco host support and the four 10GBASE-SR endpoints instead of treating the MPO connector as enough evidence.
Keep QSFP-40G-CSR4 separate from SR4, CSR-S, BiDi, LR4, and copper QSFP assemblies in receiving and spare inventory. The connector, reach profile, and breakout role are different even when the port rate is still 40G.
Product Comparison
|
Parameter |
QSFP-40G-CSR4 |
QSFP-40G-CSR-S | ||
|---|---|---|---|---|
|
Product type |
40GBASE-CSR4 QSFP transceiver |
40GBASE-SR4 QSFP transceiver |
40GBASE-CSR QSFP transceiver |
40GBASE-SR-BiDi QSFP transceiver |
|
Connector type |
MPO or MTP multifiber |
MPO or MTP multifiber |
Duplex LC |
Duplex LC |
|
Fiber type |
Multimode fiber |
Multimode fiber |
Multimode fiber |
Multimode fiber |
|
Optical lane design |
Four 10G lanes |
Four 10G lanes |
Four 10G wavelengths |
Two 20G BiDi channels |
|
Wavelength profile |
850 nm |
850 nm |
Four 10G wavelengths on MMF |
832 to 918 nm |
|
Reach on OM3 |
300m |
100m |
300m |
100m |
|
Reach on OM4 or OM5 |
400m |
150m |
400m on OM4 and 440m on OM5 |
150m |
|
4x10G breakout support |
Supported with parallel-to-duplex breakout cable |
Supported with external parallel-to-duplex breakout cable |
Duplex LC CSR optic, not an SR4 breakout optic |
Not an SR4 breakout optic |
|
Power consumption |
1.5W |
1.5W |
3.5W |
3.5W |
|
Pull tab color |
Orange |
Beige |
Orange |
Gray |
- In a QSFP-40G-CSR4 vs QSFP-40G-SR4 comparison, the practical difference is multimode reach: QSFP-40G-CSR4 extends the parallel MMF design to 300m on OM3 and 400m on OM4 or OM5.
- The QSFP-40G-CSR4 difference from QSFP-40G-CSR-S is connector design, because CSR4 uses MPO or MTP parallel fiber while CSR-S is the duplex LC CSR option.
- QSFP-40G-CSR4 vs QSFP-40G-SR-BD is a fiber-count and reach comparison; CSR4 stays on the SR4-style parallel-fiber path, while SR-BD uses two-strand LC MMF.
- For which model to choose, match the Cisco SKU to the required connector, MMF grade, reach target, breakout requirement, and Cisco host compatibility.
Selection Guide
1. Select it for long SR4-style MMF channels
Choose QSFP-40G-CSR4 when the BOM requires Cisco 40G Ethernet over parallel multimode fiber and the channel length is beyond the QSFP-40G-SR4 reach class.
2. Keep SR4 where the shorter reach is enough
Use QSFP-40G-SR4 instead when the documented 100m OM3 or 150m OM4 or OM5 reach meets the design and the order does not need the CSR4 extended distance profile.
3. Use CSR-S only for duplex LC CSR designs
Move to QSFP-40G-CSR-S only when the cabling plan is built around duplex LC multimode fiber rather than a 12-fiber MPO or MTP parallel run.
4. Confirm host support before approving the line
Verify the Cisco device, software support, QSFP 40G port role, connector polish, fiber grade, and 4x10G breakout plan before adding this optic to the quote.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Cisco host support |
Target switch, router, module, QSFP 40G port, and minimum software support in Cisco compatibility documentation |
Keeps the optic tied to a Cisco-supported platform and release |
|
Fiber connector |
MPO or MTP multifiber patching with PC or UPC polish |
Prevents accidental ordering for LC BiDi or LC CSR-S cabling |
|
Fiber grade and reach |
OM3 to 300m or OM4 and OM5 to 400m, with shorter OM2 or OM1 limits reviewed if used |
Aligns the optic with Cisco cabling tables |
|
Link mode |
Native 40G CSR4 or 4x10G breakout through parallel-to-duplex fiber cabling |
Separates direct 40G patching from breakout assemblies |
|
Power and temperature |
1.5W module power and 0 to 70 degrees C commercial operating range |
Checks host power and environment assumptions |
|
Receiving label |
Orange pull tab and Cisco CSR4 description on the received module |
Catches wrong-family optics before installation |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | QSFP-40G-CSR4 | Cisco ordering ID | QSFP-40G-CSR4= |
| Product type | 40GBASE-CSR4 QSFP optical transceiver | Ordering description | 40GBASE-CSR4 QSFP+ transceiver module for MMF |
| Form factor | QSFP | Host interface | Cisco QSFP 40G port |
| Ethernet rate | 40 Gigabit Ethernet | Optical lane design | Four 10G lanes |
| Connector type | MPO or MTP multifiber connector | Fiber type | Multimode fiber |
| Wavelength | 850 nm | Transmit and receive wavelength range | 840 to 860 nm |
| Core size | 50 microns | Modal bandwidth | 500 MHz*km on OM2; 2000 MHz*km on OM3; 4700 MHz*km on OM4 or OM5 |
| Reach on OM2 | 82m | Reach on OM3 | 300m |
| Reach on OM4 | 400m | Reach on OM5 | 400m |
| Breakout mode | 4x10G mode with parallel-to-duplex fiber breakout cable | Compatible 10G interface class | 10GBASE-SR interfaces |
| Transmit power per lane | -7.3 to -1.2 dBm | Receive power per lane | -9.9 to -1 dBm |
| Power consumption | 1.5W | Pull tab color | Orange |
| Operating temperature range | 0 to 70 degrees C | Storage temperature range | -40 to 85 degrees C |
| QSFP module dimensions | 13.5 x 18.4 x 72.4 mm maximum outer dimensions | QSFP module weight | 100 grams or less |
| Minimum cabling distance | 0.5m for SR4 and CSR4 modules | BER note | Complies with IEEE specifications with link BER better than 1E-12 |
Get More Information
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